|Publication number||US4455873 A|
|Application number||US 06/327,455|
|Publication date||Jun 26, 1984|
|Filing date||Dec 4, 1981|
|Priority date||Dec 4, 1981|
|Publication number||06327455, 327455, US 4455873 A, US 4455873A, US-A-4455873, US4455873 A, US4455873A|
|Inventors||Leigh R. Abts|
|Original Assignee||Micro Pure Systems, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (7), Classifications (9), Legal Events (9)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to obtaining information about a fluid.
The background of this invention pertaining to detecting discontinuities in a flowing fluid stream in a narrow conduit is fully set out in my U.S. Pat. Nos. 4,112,773 and 4,214,484, both hereby incorporated by reference.
In addition to obtaining information about fluids flowing in conduits, however, it is also desirable to be able to obtain such information about large volumes of fluids standing in or slowly circulating through large containers.
I have discovered that an ultrasonic transmitter-receiver having a lens can be sealed in a protective sheath and connected to a cable thereby forming a submersible probe, which probe can be immersed in a fluid and moved around therein to take measurements at various locations.
In a preferred embodiment, an ultrasonic transmitter-receiver having a concave lens and surrounded by an electrically-grounded shield is connected to the end of a cable. The transmitter-receiver is sealed inside a protective sheath, and the cable is encased in a hollow rod so that the transmitter-receiver can be immersed in a fluid and directed to the desired locations for measurements.
In another preferred embodiment, a short conduit having an ultrasonic transmitter-receiver arranged to direct a beam transversely to flow through the conduit is connected to a pump. The conduit and pump are mounted on a rod carrying a cable to the transmitter-receiver. The probe can be placed inside a tank, and when the pump is activated, the fluid will flow through the conduit, and measurements of different portions of the fluid can be taken without moving the probe.
We turn now to the structure and operation of a preferred embodiment, after first briefly describing the drawings.
FIG. 1 is a perspective view of the probe of this invention;
FIG. 2 is an enlarged cross-sectional view of the protective sheath of the probe of FIG. 1; and
FIG. 3 is a perspective view of another probe of this invention.
Referring to FIG. 1, there is shown a probe 10 having a protective sheath 20 mounted on a hollow rod 50.
As shown in FIG. 2, the sheath 20 contains an ultrasonic transmitter-receiver 22 having a concave lens 24 at one end and a twinax Amphanol connector 26 on the opposite end. Transmitter-receiver 22 is the same as that disclosed in my U.S. patent application Ser. No. 187,615, filed Sept. 15, 1980, now U.S. Pat. No. 4,365,515, incorporated herein by reference.
Transmitter-receiver 22 is mounted in a central cavity of a casing 28 and held in place by screws (not shown). Casing 28, the outside of which is screw-threaded, has a flat front face 30 with a lens opening 32 through which transmitter-receiver lens 24 extends. The connector 26 of the transmitter-receiver 22 extends from the other end of the casing 28.
Shielded cable connector 34 is attached to the sheath end of a twinax cable 36. Connector 34 is a standard connector, and it mates with the connector 26 of the transmitter-receiver 22.
Sheath cap 40 fits over casing 28. Cap 40 is generally cylindrical and has a small lens opening 42 in one end. The cap 40 is internally screw-threaded. Casing 28 fits in and is secured inside cap 40, and lens 24 is directed out lens opening 42. Casing 28 is sealed to cap 40 by O-ring seal 44.
The rod 50 covers a portion of the cable 36, and the rod 50 has a cylindrical body 52 attached to its lower end. The body 52 connects to the cap 40, and O-ring seal 54 seals the parts together.
The sheath 20 and the rod 50 are made of TeflonŽ, although the material may change depending upon the type of fluid in which the probe will be used.
The electronic devices to which the cable 36 is attached are the same as those in my U.S. patent application Ser. No. 136,169, filed Mar. 31, 1980, now abandoned, also incorporated herein by reference.
In operation, protective sheath 20 is assembled thereby sealing the transmitter-receiver 22 from the fluid. The transmitter-receiver 22 is operated in the same manner as in my U.S. patent application Ser. No. 136,169, filed Mar. 31, 1980. The operator, however, may hold the rod 50 at the end opposite the sheath 20 and direct a focused ultrasonic beam from the transmitter-receiver 22 into any place in a container of liquid. Therefore, in a large container in which the particulates to be measured may have settled into the corners or to the bottom, the probe 10 can be directed thereto in order to detect them.
Referring to FIG. 3, another probe is shown at 70. Probe 70 comprises a conduit 72, a transmitter-receiver 74 of the same type as that of the preferred embodiment, and a pump 80.
The conduit 72 extends about 8 inches in length, and transmitter-receiver 74 is positioned in the side of the conduit 72 near its intake end so as to direct an ultrasonic beam across the flow therethrough. Rod 76 covers a cable 78 from the transmitter-receiver 74.
Pump 80, which is a small diaphragm type, is positioned near the other end of the conduit 72. Air exhaust and air supply pipes 82, 84 are connected to the pump 80.
In operation, the probe 70 is placed in the bottom of a tank, and the pump 80 is activated. Pump 80 continuously forces fluid through the conduit, and transmitter-receiver 74 detects any discontinuities in this flow. Thus, with the pump in operation, the probe 70 can remain in place, while fluid throughout the container will be circulated past the transmitter-receiver 74.
Other embodiments of the invention will occur to those skilled in the art.
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|U.S. Classification||73/629, 73/632|
|International Classification||G01N29/02, G10K11/35, G01N29/032|
|Cooperative Classification||G10K11/352, G01N29/032|
|European Classification||G01N29/032, G10K11/35B|
|Feb 25, 1983||AS||Assignment|
Owner name: MICRO PURE SYSTEMS, INC.; SMITHFIELD, RI. A CORP
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ABTS, LEIGH R.;REEL/FRAME:004097/0616
Effective date: 19830201
|Mar 4, 1983||AS||Assignment|
Owner name: FIRST NATIONAL BANK OF BOSTON, BOSTON, MA.,
Free format text: SECURITY INTEREST;ASSIGNOR:MICRO PURE SYSTEMS, INC.;REEL/FRAME:004100/0562
Effective date: 19830211
|Jun 29, 1987||FPAY||Fee payment|
Year of fee payment: 4
|Sep 25, 1989||AS||Assignment|
Owner name: MONITEK TECHNOLOGIES, INC., A CORP. OF DE, DELAWAR
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO PURE SYSTEMS, INC.;REEL/FRAME:005142/0422
Effective date: 19890913
|Oct 6, 1989||AS||Assignment|
Owner name: MONITEK TECHNOLOGIES, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MICRO PURE SYSTEMS, INC.;REEL/FRAME:005178/0284
Effective date: 19890913
|Oct 25, 1991||FPAY||Fee payment|
Year of fee payment: 8
|Jan 30, 1996||REMI||Maintenance fee reminder mailed|
|Jun 23, 1996||LAPS||Lapse for failure to pay maintenance fees|
|Sep 3, 1996||FP||Expired due to failure to pay maintenance fee|
Effective date: 19960626